^Hammarström, Harald; Forkel, Robert; Haspelmath, Martin; Bank, Sebastian (编). Chepya. Glottolog 2.7. Jena: Max Planck Institute for the Science of Human History. 2016.
Kingsadā, Thō̜ngphet, and 新谷忠彦. 1999. Basic Vocabularies of the Languages Spoken in Phongxaly, Lao P.D.R. Tokyo: Institute for the Study of Languages and Cultures of Asia and Africa (ILCAA).